#include <REGX52.H>

void Delays(unsigned int time)
{
	unsigned char i,j;
	
	while(time--)
	{
		i=2;
		j=199;
		do
		{
			while(j--);
		}while(i--);
	}

}

void main()
{
	unsigned char LEDNum=0;
	P2=~0x01;
	
	while(1)
	{
		if(P3_1==0)
		{
			Delays(20);
			while(P3_1==0);
			Delays(20);
			
			LEDNum++;
			if(LEDNum>=8)
				LEDNum=0;
			
			P2=~(0x01<<LEDNum);
		}
	
		if(P3_0==0)
		{
			Delays(20);
			while(P3_0==0);
			Delays(20);
			
			
			if(LEDNum==0)
				LEDNum=7;
			
			else 
				LEDNum--;
			
			P2=~(0x01<<LEDNum);
		}
	}
}